I don't think the CEO will deal with individual customers on an international level. I would reach out to their compliance officer for the EU / Germany but they will most likely tell you the same thing. It's only going to get worth from here onwards in particular for people living in the EU. Your client should start looking into alternatives OUTSIDE of Germany.
I've been stacking for a very long time and accumulating (and selling Bitcoin) has never been as complicated at is right now.